Having recently completed a fairly long journey with the tow haul, I'd say it really does help quite a bit. It hold the shift substantially longer. On the down grades it holds the gear and seems to help with some engine braking. I did not use it 100% of the time, but it was noticeably better when I did need it.kenfyoozed wrote:How much does the tow/haul help?
The HPPIII does adjust shift points. It works mostly at full throttle, however you can set the 3-4 shift point about 12 mph higher and get it to quit stutter shifting back and forth while pulling a slight grade. Paul and I both did that. I was able to get somewhat better shifts in the other gears too, but the shift firmness setting may play more of a part there. I would not live with out that. It is the biggest reason TO get a HPPIII.
Im clueless wehn it comes the electrial parts of our rides, but isnt there a device that is plug and play to change the shift points for our trannys.
Perhaps. I think installing the tow/Haul BCM and switch is the easy way to do that. It works for me.Couldnt something like this be programmed the same way and then be turned on and off? Or am I way off base?
The "mod" doesn't, however if you do not have the BCM programmed to match the vehicle, then yes the SRS light is illuminated. Mine is as I have never had that done and usually wheel with the fuse pulled anyway.kenfyoozed wrote:But doesnt this mod disable the airbags?
green02crew wrote:I would be happy to have that figured out as well. I'm still holding onto my stock BCM for the day it's traded so the airbag light will be off. I would love to ditch some old parts from the collection! I also don't think the BCM has anything to do with gearing.
Jongo88 wrote:Whats to tell?? You send him your PCM and he can make it do just about anything you want. I sent him mine for a tune and he added the tow/haul to it. I picked up a tow/haul switch from the junk yard ran one wire to the PCM and bingo. I have a tow/haul.
Ah, makes more sense now. I suspect that it is more shift firmness than a true tow/haul mode mapping.Jongo88 wrote:No dash light. For that you need the BCM. I forget which pin it is. He sent a 6 inch wire with the female pin that I had to install into the PCM plug. The wire then goes to the tow/haul switch. The other side of the switch wire goes to ground. When you push the switch it changes to the other trans tune. On mine he programmed it to shift at a higher rpm and firmer. You push it again and it goes back to the other tune. I would say stock but I had him firm it up too.
With the tow/haul and the B&M I have 6 shift patterns.
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